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This paper proposes nominal decomposition for calculating color space transformation in single assignment language, to speed up execution time. Chromaticity coordinate transformation is discussed within the framework of nominal decomposition. The numerical value is decomposed into nominal value and base value, respectively. Such an algorithm is suitable for the programming of single assignment C. The hardware description language VHDL can be generated by using Data Flow Graph in a single assignment C compiler. The results will show that the proposed algorithm can shorten the execution time to a certain extent.
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